topic Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest? in ModelBuilder Questions

How do you join (or dissolve) a line segment to its neighbour that is the shortest?

Anonymous User — Mon, 20 Feb 2017 15:34:46 GMT

Hi, what I am trying to do is join/merge/dissolve a line segment (part of one line feature class) to its closest shortest line (within the same feature)

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

AbdullahAnter — Mon, 20 Feb 2017 15:40:25 GMT

Do you mean separate lines in one record, or auto matching between two closest lines?

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

DanPatterson_Retired — Mon, 20 Feb 2017 15:45:53 GMT

dissolve and unsplit line offer nothing? how many features do you have to do and how many times do you have to do this? seems like a bit of overkill to try to develop a model for this unless it is needed because of some issue with your incoming data source

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

Anonymous User — Mon, 20 Feb 2017 15:53:34 GMT

auto matching between two lines. Basically imagine there are 3 line segments in a row (10m, 5m & 15m) I want the 5m segment to dissolve into the 10m segment.

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

Anonymous User — Mon, 20 Feb 2017 15:54:45 GMT

Can't use unsplit line because of licence level. (see above comment which describes what I want to do). I have to do this for around 1000 line segments.

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

AbdullahAnter — Mon, 20 Feb 2017 15:55:52 GMT

solve it with topology

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

Anonymous User — Mon, 20 Feb 2017 15:57:05 GMT

Remind me how that can be done?

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

AbdullahAnter — Mon, 20 Feb 2017 18:16:21 GMT

see that link:

Geodatabase topology rules and topology error fixes—Help | ArcGIS Desktop

Read Line rules ,

Must Not Have Dangles

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

DanPatterson_Retired — Mon, 20 Feb 2017 20:20:55 GMT

wouldn't that just handle dangles and not the case where the shortest segment may be between two other segments as in the case in the example of 10, 5, 15 that Tim used? Basically I can think of too many exceptions to a rule set, I don't suppose dissolving them then resplitting using positionAlong (ie 50% or something) would be any use.

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

AbdullahAnter — Mon, 20 Feb 2017 21:36:09 GMT

I am not choose that rule , because the lines have dangles. but the method of solve dangles (Extend)

He can use extend to match closest line.

Re: How do you join (or dissolve) a line segment to its neighbour that is the shortest?

DarrenWiens2 — Mon, 20 Feb 2017 21:53:24 GMT

Just a few points of clarification:

- do the "closest" lines have to be distance = 0?

- does every line segment need to be merged with one other line segment, or will some remain un-merged?

- once a line segment is merged, does it become a candidate for other line segments to merge onto?

- can you describe the steps (i.e. the algorithm) that will produce the results you're after?

- your example of three segments can be solved very easily, but what about if you had 4 segments (10,5,5,15)? I guess if you start at the beginning you would be left with two segments (15,20). But, what if the first segment you considered happened to be in the second position (5). Then, you'd be left with three segments (10,10,15). Basically, it will depend greatly on the order in which you consider the segments.